Windows Mouse Driver Files Not Digitally Signed

Acer 5253 laptop, Windows 7 Home Premium 64bit SP1, AMD C-50.

Trying to use a USB mouse. I have 3 logitech mice. None work because hidclass.sys and hidusb.sys are not digitally signed. If I f8 and disable driver signing enforcement, all 3 mice work, so I'm pretty certain that's the issue.

Tried "Update Driver" via device manager. Windows determined that I already had the best driver and wouldn't do anything. Logitech does not furnish drivers for Windows 7. They rely on the native drivers.

Acer does not furnish mouse drivers. They refer you to the manufacturer of the mouse. Tried copying the files in question from a 64bit machine that showed them to be digitally signed. Renamed the ones on my machine and pasted the ones from the "good" machine. Resolved nothing.

chkdsk /r found problems and repaired them. Didn't help.

sfc /scannow found problems that it could not resolve. Looked in CBS.log and found no references to either of the sys files in question. No resolution.

System Restore only had one restore point, and it was from 2 days ago. Problem was already noticed by then. I suspect that it's been this way since I purchased the laptop a couple of months ago anyway, but if there had been a restore point back at the very beginning, I'd have tried that.

I don't know much about digital signing of drivers. I've seen in a couple of threads that I might be able to sign the drivers myself, but haven't been able to find out the actual steps to do so. Is the digital signature part of the driver file itself? Or is it another file? If so, where's that file? Or is it a registry entry? If so, can I manipulate that to resolve the problem?

I miss XP. All I want to do is use the simplest of all plug and play devices. It's been about 3 weeks and I still can't get Windows 7 to cooperate.